A pH meter (Leici PHS-25, China) was employed
for pH measuring. A PerkinElmer AAnalyst 700 atomic
absorption spectrometer (AAS) (Massachusetts, USA) was
used to analyze zinc ion concentrations in solutions. The
FT-IR spectra of unloaded biosorbent and zinc(II) loaded
biosorbent were taken using KBr discs at 400–4000 cm